"KEEP MOVING FORWARD."

It makes sense for Amity's crush to seem obvious to us since it's a cartoon, but I feel like if Amity was actually that obvious, literally anyone would've pointed something out by now.

Boscha does mention that Amity had gotten softer since Grom, but she didn't know why. Willow looked at Amity suspiciously but never said anything otherwise. If we think about it, Amity never really did much other than blush at Luz. And when she was close to having someone call her out, those were the only times people actually almost caught on.

The fact that Gus calls out Luz shows that this isn't the first time and Luz is really bad at hiding it. Yet, Amity keeps getting surprised at Luz's actions towards her. Shes absolutely stunned when she sees that Luz is crying and admits to being stupid around her too.

And even after all that, she finally talks to Ed and Em about how Luz confuses her and she's feeling and things and thinking things she's never felt/thought before.

I think Amity felt the want of going to Grom with Luz, but didn't really know why. It frustrated and confused her, and when she looks down at her library badge, she realizes that she likes Luz. Maybe because of how selfless Luz is to have gone through all of that to get her job back for her.